The coastal region of Fujian contains numerous existing stone masonry structures,many of which are constructed on soft soil sites.Previous studies have shown that the soil-structure interaction(SSI)effect on soft soil...The coastal region of Fujian contains numerous existing stone masonry structures,many of which are constructed on soft soil sites.Previous studies have shown that the soil-structure interaction(SSI)effect on soft soil foundations can prolong the structure's natural vibration period and enhance its seismic response.We develops a soilstructure interaction system model and a comparative rigid foundation model using the finite element software LS-DYNA to investigate the impact of SSI on the dynamic characteristics and seismic response of stone structures.The results indicate that the SSI effect alters stone structures'dynamic properties and seismic response.This alteration is evident in the extended natural vibration period,which reduces overall stiffness,increases interstory displacement angles,and slightly decreases the acceleration response.Under both SSI and FIX systems,the structural failure mode is characterized by the external collapse of the second-story stone walls,which causes the roof stone slabs to lose support and fall,leading to overall collapse.The FIX system demonstrates better structural integrity and stability with slower crack development.In contrast,the SSI system exhibits cracks that appear earlier and develop more rapidly,causing more severe damage.The research findings provide a theoretical basis for the seismic reinforcement of existing stone structures on soft soil foundations.展开更多
This paper analyses the fragmenting principle of static blasting agent (SBA) and the action of its cutting fragmentation. Using SBA for sterming material proved very useful and advantageous. Here we analyse in detail ...This paper analyses the fragmenting principle of static blasting agent (SBA) and the action of its cutting fragmentation. Using SBA for sterming material proved very useful and advantageous. Here we analyse in detail the cutting action of pre- stress and stress wave in pre-stressing force blasting.展开更多
Saudi Arabia is rich not only in its oil, but also in its cultural heritages. With 1,500 rock arts and 4,000 archaeological sites it is the fourth largest rock art region in the world. The entire Saudi Arabia has been...Saudi Arabia is rich not only in its oil, but also in its cultural heritages. With 1,500 rock arts and 4,000 archaeological sites it is the fourth largest rock art region in the world. The entire Saudi Arabia has been comprehensively surveyed, investigated, and documented under the auspices of the Saudi Arabian Department of Antiquities （now Saudi Commission for Tourism and Antiquities）. The archaeological and rock art investigations revealed tantalizing results providing the evidence of human presence in the Arabian Peninsula from the early Acheulean period until the present day. In addition to the ancient towns and cities like Madain Saleh （contemporary to Petra in Jordan）, Tayma, Domat al-Jandal, Thaj, and al-Fao and Ukhdoud hundreds of strange, mysterious, and mystic structures and petrolyghs are located in the deserts of Arabia. A few of such sites are discussed in this paper, highlighting the strong but still unknown to the world the cultural heritage of Saudi Arabia.展开更多
基金jointly sponsored by Fujian Province construction science and technology development research project(2023-B-07,2023-K-47,2022-K-118)。
文摘The coastal region of Fujian contains numerous existing stone masonry structures,many of which are constructed on soft soil sites.Previous studies have shown that the soil-structure interaction(SSI)effect on soft soil foundations can prolong the structure's natural vibration period and enhance its seismic response.We develops a soilstructure interaction system model and a comparative rigid foundation model using the finite element software LS-DYNA to investigate the impact of SSI on the dynamic characteristics and seismic response of stone structures.The results indicate that the SSI effect alters stone structures'dynamic properties and seismic response.This alteration is evident in the extended natural vibration period,which reduces overall stiffness,increases interstory displacement angles,and slightly decreases the acceleration response.Under both SSI and FIX systems,the structural failure mode is characterized by the external collapse of the second-story stone walls,which causes the roof stone slabs to lose support and fall,leading to overall collapse.The FIX system demonstrates better structural integrity and stability with slower crack development.In contrast,the SSI system exhibits cracks that appear earlier and develop more rapidly,causing more severe damage.The research findings provide a theoretical basis for the seismic reinforcement of existing stone structures on soft soil foundations.
文摘This paper analyses the fragmenting principle of static blasting agent (SBA) and the action of its cutting fragmentation. Using SBA for sterming material proved very useful and advantageous. Here we analyse in detail the cutting action of pre- stress and stress wave in pre-stressing force blasting.
文摘Saudi Arabia is rich not only in its oil, but also in its cultural heritages. With 1,500 rock arts and 4,000 archaeological sites it is the fourth largest rock art region in the world. The entire Saudi Arabia has been comprehensively surveyed, investigated, and documented under the auspices of the Saudi Arabian Department of Antiquities （now Saudi Commission for Tourism and Antiquities）. The archaeological and rock art investigations revealed tantalizing results providing the evidence of human presence in the Arabian Peninsula from the early Acheulean period until the present day. In addition to the ancient towns and cities like Madain Saleh （contemporary to Petra in Jordan）, Tayma, Domat al-Jandal, Thaj, and al-Fao and Ukhdoud hundreds of strange, mysterious, and mystic structures and petrolyghs are located in the deserts of Arabia. A few of such sites are discussed in this paper, highlighting the strong but still unknown to the world the cultural heritage of Saudi Arabia.
